Patients are referred to the Kameron Gait and Motion Analysis Laboratory to obtain an in-depth understanding of their movement patterns. Electromyography is used to determine muscle firing patterns and to identify muscles responsible for abnormal movements. Joint motion during walking is quantified by placing markers on the patients' limbs and filming their movement using a sophisticated motion analysis system. This system, which utilizes video and computer technology, provides a three-dimensional depiction of motion at the joints of the lower and upper extremity during walking. Force plates in the floor determine the ground reaction and joint forces acting on the stance limb. When indicated, the energy cost of walking is calculated by the use of oxygen consumption.